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OpenAI: GPT-5.3-Codex

openai/gpt-5-3-codex
CompareAPITry this model

GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2.

Modalities
In / out per 1M$1.75 / $14
Context391K
ReleasedFeb 24, 2026

Providers

3 providers serve this model upstream.

Providers serving this model
ProviderInput /MOutput /MCache read /MLatency P50Throughput P50Uptime
Azure$1.75$14$0.173.63s61 tps100%
OpenAI$1.75$14$0.171.76s90 tps100%
OpenAI$3.50$28$0.350.93s156 tps—

Market-wide measurements, refreshed every 15 minutes. They describe who serves GPT-5.3-Codex in general, not how ProjectCOZY routes your requests.

Pricing

List rates per 1M tokens — what GPT-5.3-Codex costs pay-as-you-go elsewhere, not what you pay here.

Input
$1.75
per 1M tokens
Output
$14
per 1M tokens
Cache read
$0.17
per 1M cached tokens
Included in every pass
GPT-5.3-Codex is included in every ProjectCOZY pass at no extra cost — one flat rate, no per-token metering. The rates above are there for comparison.

Performance

Time to first token and output speed across every provider, over the last 3 days.

0.0s2.5s5.0s7.5s10.0s
Oct 29, 12 AMOct 29, 8 AMOct 29, 4 PMOct 30, 12 AMOct 30, 8 AMOct 30, 4 PMOct 31, 12 AMOct 31, 8 AMOct 31, 4 PMNov 1, 12 AMNov 1, 8 AM
Azure OpenAI
0 tok/s50 tok/s100 tok/s150 tok/s200 tok/s
Oct 29, 12 AMOct 29, 8 AMOct 29, 4 PMOct 30, 12 AMOct 30, 8 AMOct 30, 4 PMOct 31, 12 AMOct 31, 8 AMOct 31, 4 PMNov 1, 12 AMNov 1, 8 AM
Azure OpenAI

Uptime

100% of requests were served successfully over the last 3 days, across all providers.

Last 3 daysAvailability 74.25%
Oct 29, 6:00 PMNow
Availability over the last 24 hoursAvailability 70.79%
100% 83% 67% 50%
Oct 31, 6:10 PMNow

Apps

Tools that most often run GPT-5.3-Codex, by tokens this week.

CodexCli Agent · 50.3% of tokens92.1BFramer39.1% of tokens71.7BItoCloud Agent · 8.7% of tokens15.9BKilo CodeCli Agent · 1% of tokens1.8BHermes AgentPersonal Agent · 1% of tokens1.8B

Activity

219.2B tokens processed market-wide in the last month.

020.0B40.0B60.0B80.0B
Oct 2Oct 7Oct 12Oct 17Oct 22Oct 27Nov 1
Tokens

FAQ

Which model id do I use for GPT-5.3-Codex?
openai/gpt-5.3-codex. Send it as the model field from any OpenAI-compatible client, against https://minuykh.app/v1.
How much context does GPT-5.3-Codex hold?
400,000 tokens per request, of which up to 128,000 can be the response.
What can it accept and return?
Input: text, image, file. Output: text.
What does GPT-5.3-Codex cost on a pass?
Nothing beyond the pass itself. Pay-as-you-go elsewhere it lists at $1.75 per 1M input tokens and $14 per 1M output tokens.
Who built GPT-5.3-Codex?
OpenAI, in the GPT family.

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